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If this should go in the Buffalo forum it can be moved; I thought it more related to the USB module.
I am trying to get the following setup to work:
Windows 7 64bit -> Foobar/WASAPI -> TPA USB receiver via SPDIF -> Buffalo II -> analog out
I actually need not specify Foobar/WASAPI, because it seems as though EVERY playback option I try results in the audio stuttering, as if it's a buffering issue. I've tried Windows Media Player, and I've tried directsound instead of wasapi in foobar, but it always seems to stutter. I've tried adjusting the buffer size everywhere between 50ms and 1000ms (after ~1000ms, I get no playback at all.)
I tried using my Alien DAC (PCM2702) and there is no stuttering. Just as a sanity check, I verified that BOTH DACs work on my other computer (XP, Foobar/ASIO4ALL.)
Is there anything I haven't tried yet on the software side of things that may help? I don't think there is any problem with the hardware because it works on my other machine.
Thanks!
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There is nothing particular to the USB module that would cause this.
It sounds like there is perhaps a problem with the USB driver? There is really no way for me to know. I have never seen this happen.
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The driver that Windows installs for it (automatically) is a generic "USB Audio DAC" driver. I'm not sure how I would go about installing a different one if I wanted to, or even which different one I might install. It shows up in WASAPI as "Speakers (USB Audio DAC)" and I think this is normal; I remember seeing something similar under XP.
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I don't mean the USB audio driver. I mean the USB host controller driver. This could really be a hardware or driver issue or something else completely. I can't replicate so it is hard for me to diagnose. Edited by user Monday, November 15, 2010 5:59:18 PM(UTC)
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Interesting development... I tried re-routing the USB cable away from power cords and it seems to have mostly solved the issue. I got it into a position where I listened to about an hour of music without hearing any errors. I'm wondering if the ground loop caused by the USB shield (ground) connection to the DAC chassis might be causing the signal to get corrupted enough to drop out. I am thinking I will try hooking up the TOSLINK out of my computer instead to see if I can avoid these types of problems, but it's disturbing nonetheless 
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Or, just don't connect the USB ground to the chassis. There is no reason to do so.
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The USB ground would still be connected to earth ground, but it would be through the computer chassis instead of the DAC chassis so I will try this as well. Would it even be possible to put a ground loop breaker between the USB module's output GND pad, and GND on the Buffalo II board? I wonder if this would help or hurt.
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Quote:The USB ground would still be connected to earth ground, but it would be through the computer chassis instead of the DAC chassis Perhaps, but it would not be a loop. Quote:Would it even be possible to put a ground loop breaker between the USB module's output GND pad, and GND on the Buffalo II board You would simply use a pulse transformer for the S/PDIF connection to the DAC, which would provide galvanic isolation of the two.
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Is there a specific model of pulse transformer that you could recommend for this application? I am using a voltage divider to use the chip's S/PDIF mode.
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We use the Newava S22083.
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This one would be better: http://onecall.farnell.c...t-1-00-1-59mh/dp/1362398You can use down to about .1uF for the cap Edited by user Thursday, June 2, 2011 11:28:22 AM(UTC)
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Ok... I'm a little lost. What are the 2 In's? In the DAC schematic there are 4 wires for usb: 1,2,3,4. 1 and 4 are Vbus and GND. 2,3 are signal. Where does the transformer go? Or is one transformer for each signal? D- and D+ ? Thanks a lot! Edited by user Thursday, June 2, 2011 11:36:53 AM(UTC)
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The pulse transformer is for the S/PDIF connection, not the USB connection.
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Oh ... I wanted to isolate the USB.. guess it's not worth the trouble ?
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Did you ever resolve this issue? I'm getting intermittent dropouts (for nor more than half a second at a time) using both Foobar and audio through other programs when connected via USB.
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I have also had the dread USB stuttering issue, still unresolved, but now there's a new twist. I just got an Apple TV 3 and connected it via TOSLINK to my Buffalo II kit. It also stutters on audio. When the Apple TV is connected via HDMI to a TV, there is no audio stutter. When a Mac Mini is connected to the Buffalo via the same TOSLINK receiver, it does NOT stutter.
Typically, the stuttering takes some time (10-40 minutes) before it gets going, but once it's going, it's unlistenable.
I've tried a USB isolator, and now an optical connection does it as well, so it's not a ground issue. Could there be some sort of timing or synchronization issue at the level of the MUX or Buffalo II? Is there any choice in the DIP switches that could screw this up?
My configuration: S/PDIF inputs > MUX > Buffalo II
Inputs:
1. digital on copper wire (from an Oppo player – always works)
2. USB via USB isolator and USB to S/PDIF converter (from a Mac Mini – stutters)
3. optical via TP receiver (from an Apple TV - stutters; or a Mac Mini - always works)
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